Lamp holder



FIG. 1 is a perspective view of a lamp holder, showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a schematic view showing two working lights are retained by the lamp holder, wherein the two working lights shown in broken lines are for illustrative purpose only and form no part of the claimed design. 

The ornamental design for a lamp holder, as shown and described. 